From b6e016eb09b7de037013547dd851ddb3f98943a3 Mon Sep 17 00:00:00 2001
From: bekzod <bekzod@me.com>
Date: Thu, 5 Oct 2017 23:43:32 +0500
Subject: [PATCH] fix `canInvoke` for edge cases

---
 packages/ember-utils/lib/invoke.js            | 2 +-
 packages/ember-utils/tests/can_invoke_test.js | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/ember-utils/lib/invoke.js b/packages/ember-utils/lib/invoke.js
index e708b81d854..688be948b24 100644
--- a/packages/ember-utils/lib/invoke.js
+++ b/packages/ember-utils/lib/invoke.js
@@ -19,7 +19,7 @@ import applyStr from './apply-str';
   @private
 */
 export function canInvoke(obj, methodName) {
-  return !!(obj && typeof obj[methodName] === 'function');
+  return obj !== null && obj !== undefined && typeof obj[methodName] === 'function';
 }
 
 /**
diff --git a/packages/ember-utils/tests/can_invoke_test.js b/packages/ember-utils/tests/can_invoke_test.js
index 5dc7ba9be49..a3974a1c99d 100644
--- a/packages/ember-utils/tests/can_invoke_test.js
+++ b/packages/ember-utils/tests/can_invoke_test.js
@@ -19,6 +19,12 @@ QUnit.test('should return false if the object doesn\'t exist', function() {
   equal(canInvoke(undefined, 'aMethodThatDoesNotExist'), false);
 });
 
+QUnit.test('should return true for falsy values that have methods', function() {
+  equal(canInvoke(false, 'valueOf'), true);
+  equal(canInvoke('', 'charAt'), true);
+  equal(canInvoke(0, 'toFixed'), true);
+});
+
 QUnit.test('should return true if the method exists on the object', function() {
   equal(canInvoke(obj, 'aMethodThatExists'), true);
 });